What is a Terrain Obscuration Model?

Particularly relevant for ground-vehicle-based GNSS receivers, terrain obscuration is the phenomenon of temporary and intermittent masking of GNSS signals when manoeuvring at low altitude in mountainous terrain. This can be a critical limiting factor on the performance of GNSS receivers in certain applications, and so the ability to simulate such effects is an important tool in improving the reliability and performance of GNSS receiver designs.

Spirent SimGEN™ software contains a comprehensive terrain obscuration model for terrestrial vehicles that allows GNSS receiver manufacturers to assess the performance of their designs under such conditions.

Within the SimGEN software, the user has full control over the proximity of the terrain, its maximum and minimum height above the WGS-84 ellipsoid, and its maximum and minimum width. When running the model, the terrain height and width are varied pseudorandomly, and the pattern of interruption is accurately repeated on consecutive simulation runs with the timing of changes proportional to the vehicle speed. In addition, the terrain type can be modified during the simulation, with the horizontal distance travelled determining the point at which the terrain changes.


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